1. Bokhari, A. H., Asghar, M., Ahmed, M. S., Rashid K., and Shabbir, G. (1998). Nuovo Cimento
B113, 349.
2. Kramer, D., Stephani, H., Herlt, E., and MacCallum, M. A. H. (1980). Exact Solutions of Einstein Field Equations, Cambridge University Press, Cambridge.
3. McIntosh, C. B. G. (1975). Phys. Lett.
50A, 429
4. Taub, A. H. (1972). In General Relativity: Papers in Honor of J.L. Synge, L. O'Raifeartaigh (Ed.), Oxford University Press, London, Chap. VIII, p. 133
5. Cahill, M. E. and Tuab, A. H. (1971). Commun. Math. Phys.
21, 1